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Determination of humidity of the troposphere by GNSS signals

机译：GNSS信号测定对流层湿度

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The lower neutral part of the atmosphere (troposphere) where the GNSS signals are refracted is one of the reasons for the errors in the accuracy of GPS positioning. The total zenith tropospheric delay (ZTD) is the difference between the assumed straight line along which the GPS signal propagates at the speed of light in a vacuum and the actual path from source to receiver. Atmospheric water vapor affects the speed of propagation of GPS signals, and it is characterized by rapid variability as well as a significant mutual influence on the variability of other meteorological parameters. The possibility of determining the content of water vapor in a conventional vertical column to the level of the upper part of the troposphere using the GPS measurement method, as well as using meteorological data is considered. The results of processing primary GPS data give continuous atmospheric data in the form of a total zenith tropospheric delay (ZTD). Data on the "wet'" component of the total zenith tropospheric delay (ZWD) can be converted with very high reliability into the integrated water vapor (IWV) data above the observation point.
机译：GNSS信号被折射的大气层（对流层）的较低中性部分是GPS定位精度误差的原因之一。总天顶对流层延迟（ZTD）是GPS信号在真空中以光速传播所沿的假定直线与从源到接收器的实际路径之间的差。大气水汽会影响GPS信号的传播速度，其特点是快速变化，并且对其他气象参数的变化也有很大的相互影响。考虑使用GPS测量方法以及使用气象数据来确定常规垂直塔中对流层上部水平的水蒸气含量的可能性。处理原始GPS数据的结果以总天顶对流层延迟（ZTD）的形式给出了连续的大气数据。总天顶对流层延迟（ZWD）的“湿”分量数据可以非常高的可靠性转换为高于观测点的水汽积分（IWV）数据。

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